/Engine/Source/Editor/UMGEditor/Public/WidgetBlueprintEditorUtils.h
static int32 UpdateHittestGrid ( [FHittestGrid](API\Runtime\SlateCore\Input\FHittestGrid) & HitTestGrid, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWindow](API\Runtime\SlateCore\Widgets\SWindow) > Window, float Scale, FVector2D DrawSize, float DeltaTime )